Abstract: An evertable drum centrifuge has a drum with a generally cylindrical and perforate outer wall and having an axially forwardly open front end. An end wall of the drum can move axially between a closed position fitting in the front outer-wall end and an open position spaced axially forward of the outer wall and is centrally formed with a fill opening. An annular liner of a flexible foraminous filter medium has a front edge attached to the outer-wall end and a back edge attached to a rim of extension structure fixed on the end wall. When the end wall move between the closed and open positions, the liner moves from a normal position inside the drum and extending backward from the front end to the rim to an everted position substantially outside the drum and extending forward in the solids compartment from the front end to the rim. An axially displaceable fill tube carries an axially nondisplaceable fill head complementarily engageable in the fill opening and having an annular seal engageable with the fill tube.

Abstract: An alloy, in particular for the manufacture of spectacle frames, and a spectacle wire or a spectacle frame and connecting wires for electronic component parts manufactured using the alloy of the invention. In order to obtain good mechanical characteristics, for example, of the spectacle frame at low expense, the invention provides the following alloy which, in percentage by weight, is composed as follows: 63-78% copper, 3-7% nickel, 1-3% iron, 0.01-0.20% phosphorus, the remainder being zinc.

Abstract: A filler metal for the welding of steel and iron, copper and copper alloys, with and without surface finishing, which shows a good wetting and also a good flow for surface-treated base metals, which does not form any scales and any visible crusting and does not build up too much, thus has an insignificant pore formation and a comparatively insignificant splatter formation, has the following composition in percentage by weight:0.01-2.5% Si,0.1-0.4% Sn,0.6-1.5% Mn,0.005-0.020% P and/or0.002-0.020% B,whereby P and B together are less than 0.020%, the remainder being copper, impurities Pb less than 0.02%, other impurities together less than 0.5%.

Abstract: A wire electrode for a spark-eroding system for erosion cutting of workpieces using intermittent electrical charges includes a core of a current-conducting material and a wire coating of a material with a lower evaporation temperature, for example zinc. The core consists of one of the following alloys according to DIN (German Industrial Standard) 17666:(a) Cu Mg 0.4;(b) Cu Fe 2P;(c) Cu Cr Zr;(d) Cu Zr.